The path a body takes while moving through space under the influence of the gravitational forces of other bodies

learn more… | top users | synonyms (1)

3
votes
0answers
114 views

From Newton to Kepler without infinitesimals

I've read some interesting calculus-free proofs of at least parts of the derivation of Kepler's Laws from Newton's gravitational force. One is of course Feyman's "Lost Lecture" (which was already ...
16
votes
3answers
2k views

Are there any exact data about Earth's orbit?

Wikipedia says that the Earth's orbit's axis is $a=149\ 598\ 000\ \mathrm{km}$ and its eccentricity is $e=0.016\ 7086$, but if we use these values to find distance at aphelion and perihelion we get ...
1
vote
2answers
88 views

How much fuel do I need to send cubesat 1kg from Earth orbit to Moon orbit? [closed]

How much fuel do I need to send cubesat 1kg from Earth orbit to Moon orbit? And how much stages? For i.e. C12H22O11 + KNO3, polyethylene + oxygen or kerosene + oxygen.
2
votes
1answer
36 views

Acceleration in an elliptical binary system

So I'm having a bit of a problem dealing with binary systems. I'm looking at acceleration in a stellar system and am not sure where to begin. Assuming both stars are of equal masses, they'd be ...
3
votes
0answers
39 views

Different time between equinoxes

I calculated from here that there are 16 104 096 seconds between the vernal and autumnal equinox, if I made no mistake, this is some 650 592 s longer than the other half orbit. I imagine this is due ...
1
vote
0answers
42 views

Earth to LEO, gravity drag and potential energy

A lot of references indicate takes about 9.4 km/s of delta-v to reach LEO. https://en.wikipedia.org/wiki/Low_Earth_orbit#Orbital_characteristics The delta-v needed to achieve low Earth orbit ...
2
votes
3answers
117 views

Explaning Motion of a Man and Spacecraft Orbiting the Earth [closed]

A man and spacecraft is orbiting around the earth. The man is outside the spacecraft and is not connected to the spacecraft in any way. The distance between the man and the spacecraft remain ...
3
votes
1answer
128 views

Orbital equations of motion with respect to energy

Consider the equations of motion of an object in an orbit around a central body. We use an inertial frame originating at centre of mass of the central body: $$ \frac{d\mathbf{r}}{dt} = \mathbf{V} ...
2
votes
1answer
86 views

Calculating mass of an orbiting body with force and acceleration

I'm new to physics, and it's a lot to take in- but there is a problem that I really can't seem to wrap my head around- finding the mass of an orbiting body, like an asteroid. I've looked around a lot ...
3
votes
1answer
239 views

Relation of orbital speed and eccentricity

Earth's eccentricity is 0. 0167 and speed at perihelion is 30.3 Km/s and at aphelion 29.3 with a difference of +/- 1. 0164 wrt average orbital speed Is this a coincidence or are the variations of ...
3
votes
0answers
72 views

Why do they think WT1190F is low density?

A piece of space debris WT1190F is in the news in part because it has been far from earth (farther than lunar distance) in the past but will re-enter earth's atmosphere in a few weeks. See this note ...
0
votes
1answer
118 views

Relation of orbital radius with linear velocity of satellite [closed]

If a planet is going around the sun in a circular orbit , and if suddenly (impulsively) it's orbital radius was increased , what would happen to the linear velocity of planet (With reason)
0
votes
0answers
36 views

Efficient orbit transfer

Well simple orbital (in plane) manoeuvres are quite easy and straight forward. Currently I found however an orbit I have a hard time calculating/reasoning the ideal path to get to. - Just as a note, ...
1
vote
1answer
53 views

What is the time of impact of a dropped item at a very high altitude [duplicate]

I'm trying to automate a landing at a specific spot in Kerbal Space Program and to do that I need to know when the estimated time of impact will be. In short, I'm trying to solve the following ...
0
votes
0answers
26 views

Time of an elliptical orbit

We know that T, the time of a revolution in an elliptical orbit is equal to the time of a circular orbit, can you tell what is the formula that relates time elapsed and space travelled (on the major ...
3
votes
1answer
59 views

Relativistic effects of an orbit around sun in a different direction than Earth

If I manage to orbit around the sun at the same speed but in a different direction than the earth, will I perceive the time on earth going faster or slower than my own time? And what about people on ...
0
votes
1answer
17 views

Solving a first order non linear differential equation in the specific case of the orbit of a particle moving under a central conservative force

Hello it's my first time posting in here and I hope someone in here can help me as my teachers quite dislike questions that aren't specifically in the curriculum. I'm reading About classical mechanics ...
9
votes
3answers
2k views

What happens if you slow down a moon?

Let's say you'd put a whooping big rocket engine on the surface of the moon, and slow down its orbital velocity. Not to a complete stop, mind you. Just a bit slower than it was going before (a couple ...
1
vote
1answer
108 views

How do I calculate the effect of a prograde, retrograde, radial and anti-radial burn on the orbital elements of a two-dimensional orbit?

My relevant knowledge: This question works in two dimensions, with a two-body problem (see bottom for context). To my understanding, a two-dimensional orbit has the following orbital elements (3D ...
0
votes
2answers
100 views

Circular motion relationships

Using the formula $F=mv^2/r$ I have rearranged the formula and found that the radius is proprtional to the velocity squared. I then found a website that affirms the relationship that I found. On the ...
0
votes
2answers
129 views

Why/How do the coefficients associated with atomic orbitals superposed to form hybrid orbital determine their spatial orientation?

In my previous Phys.SE question, I asked for why $ \newcommand{\k}[2]{\langle #1|#2 \rangle} c_1,c_2,c_3,c_4$ in $$\psi_{sp^3}= c_1\psi_{2s}+ c_2\psi_{2p_{x}} + c_3\psi_{2p_y}+ c_4\psi_{2p_{z}}$$ ...
-1
votes
2answers
106 views

Calculate the Earth’s velocity in its orbit (assumed to be circular) around the Sun [closed]

Data: GM of the Sun: $\text{GM} = 1.327 \times 10^{20} \;\mathrm{m^3 s^{-2}}$ Radius of the Earth’s orbit: $r_{Earth} = 1.496 \times 10^{11} \;\mathrm{m}$ Orbital period of a planet in seconds: $T = ...
2
votes
2answers
107 views

Central force law

An object has an orbit in polar coordinates as $r(\theta) = a\theta^2$ (where $a$ is constant). Assuming the central force is directed towards the origin $r=0$, how can I know which central force law ...
2
votes
1answer
78 views

What equations are needed to describe how two bodies interact?

For a small project I am thinking about making a 2D game in which there are two planets, each of a random size, and when you run the game it will show how those planets interact due to gravity. I'm ...
1
vote
0answers
26 views

Collisions with the earth [duplicate]

The earth is traveling around the sun at around 65,000 mph. An asteroid or other large object is traveling around 35,000 mph. Depending on the direction of the impact, the object could strike head on ...
2
votes
1answer
52 views

Given an equation of an elliptical orbit, is it possible to find satellite´s speed at a certain point?

As the heading says: given an equation of an elliptical orbit, is it possible to find satellite´s speed at a certain point? I'm playing a bit with simulations of planets and satellites in the solar ...
1
vote
1answer
49 views

Would it be possible to have a planetary system where one planet is in continuous shade?

When I ask this I'm thinking of a system similar to ours, but the orbits are perfectly staggered and all planets involved have orbital periods such that when the planet (or small moon, whichever works ...
0
votes
2answers
54 views

Can tidal forces significantly alter the orbits of satellites?

I would assume that there are other larger, more significant, forces acting on artificial satellites, but can tidal forces drastically alter the orbit of a satellite over time? I was thinking this ...
1
vote
1answer
44 views

Can a natural satellite have a synchronous orbit?

I was thinking about space-elevators and large masses being put into geosynchronous orbit, when I considered the possibility of a natural satellite being in a synchronous orbit. I did a little digging ...
2
votes
1answer
77 views

Will the Earth's rotation someday be synchronized with its revolution around the Sun?

When will the earth act like the moon with regard to one side of the moon always facing the earth. Will the earth one day get locked in a rotational orbit that has one side of the planet facing the ...
1
vote
1answer
193 views

How to calculate escape velocity and orbital velocity for a cubular planet?

Given a planet that is a cube, how would one calculate the escape velocity and the orbital velocity? For a circular planet with an even distribution of mass (aka center of mass=center of volume) the ...
0
votes
1answer
140 views

What is the potential and kinetic energy of the international space station?

I know it's possible to calculate, but what formulas would I use to be as accurate as possible? I'd like to see how it works for something big and high like that.
1
vote
1answer
92 views

What is the outward force on the Moon that makes it go in orbit rather that falling straight to the Earth? [duplicate]

So, we know that the gravity is responsible for pulling the Moon towards the Earth. But because it moves in an orbit, it makes me think that there must be a force that is causing the moon to travel in ...
0
votes
1answer
159 views

Why are galaxies flat since it's an unstable configuration in 3d? [duplicate]

I'll probably have to delete this question because someone's already asked it, but what accounts for the stable 2-d structure of spiral galaxies in three dimensional space (assuming random starting ...
1
vote
1answer
238 views

Determining eccentricity of satellite orbit from velocity vectors and altitude

Let's say there's a satellite orbiting earth. At some random point in its orbit, it is observed with a tangential velocity, a radial velocity and some altitude. Given only this information (along ...
0
votes
0answers
39 views

How far inside a white dwarf Roche limit does the Earth have to be to start losing large chunks of rocks?

I have calculated that for a one solar mass white dwarf orbited by the Earth, the Roche limit is about 600,000 kilometers. I understand that any loose mass on the surface of the Earth would start ...
1
vote
1answer
1k views

What is the relation between orbital velocity and escape velocity in strongly relativistic situations?

For practical purposes, I'm considering a non-rotating black hole or neutron star, because I find Kerr black holes a little confusing. The ratio between orbital velocity and escape velocity in ...
0
votes
0answers
17 views

Find the velocities at the ends of a focal chord [closed]

Find the two velocity values occur at the two ends of a focal chord in case of a parabolic orbit.
2
votes
0answers
78 views

Shape of particle's motion [closed]

Let's a particle is moving in a orbit with force field $\vec{F}(r)= -kr^2\hat{r}$ Is there any way to tell that what would be the shape of the path of the orbital motion? Circular? Parabolic? ...
0
votes
1answer
41 views

General relativity and precession of orbits

The precession of the orbit of a planet can partially be explained when taking into account the impact of the other planets. Also general relativity is needed to describe this precession exactly. The ...
0
votes
2answers
87 views

Compass aboard the International Space Station

If an astronaut brought a compass aboard the ISS and watched it for the duration of an orbit, what would it do?
2
votes
2answers
99 views

Does The Earth appear to orbit the ISS from its point of view?

Does the International Space Station orbit the Earth with one side constantly facing the Earth? Or does it look more like the Earth is orbiting the ISS from its perspective?
14
votes
3answers
3k views

Why do we launch rockets during the day?

The clips that I have seen of rockets launching all seem to be carried out during daytime. However, we learnt at school that rockets are fired closer to the equator and towards the east to take ...
6
votes
1answer
214 views

Why doesn't space junk form a ring around Earth?

If ice and rock form rings around a planet like Saturn, why don't rings form around Earth from all of the broken satellites and other material around Earth, or will they eventually? I would expect at ...
3
votes
1answer
91 views

Pushing an object in orbit outwards

I wonder what would happen if an object in orbit were to be pushed outwards. I can imagine 2 outcomes: either it would keep spinning outwards away from whatever it is orbiting at a finite speed ...
1
vote
2answers
87 views

Why do so many galaxies in clusters have a near zero velocity?

I'm looking at a velocity chart of the Coma Cluster: And the question occurred to me: why are there so many galaxies that have a zero velocity (relative to the core of the Coma Cluster which is ...
0
votes
1answer
72 views

Clarification of the physics involved of an orbiting body in a circular orbit

I am writing a physics simulation program to simulate a body orbiting a planet but I am a little confused about the physics involved and would like some clarification. To simulate gravity I am using ...
0
votes
3answers
144 views

Can an atoms energy levels be changed by changing the de Broglie wavelength of electrons?

So an electron can only orbit a nucleus where its wavelength makes a standing wave, leading to discrete energy levels in atoms. But the de Broglie wavelength of an electron = h/mv. So the wavelength ...
0
votes
1answer
313 views

Is it possible to determine the velocity of electron in its orbit? [closed]

I read here that the orbital speed of an electron around a proton can be calculated as: $$\frac{m_ev^2}{r} = F_G+F_E$$ where $F_E$ is the proton-electron electromagnetic force, $F_G$ is the ...